Best Potatoes au Gratin Ever

Name: Best Potatoes au Gratin Ever
Ingredients: 5 tablespoons unsalted butter, divided; 1 sweet onion, thinly sliced; 3 garlic cloves, minced; 1 tablespoon grainy mustard; 2 cups half-and-half; 2 pounds potatoes, peeled and thinly sliced; Salt and freshly ground black pepper; 1/2 teaspoon freshly grated nutmeg; 3/4 cup grated Gruyère cheese

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INGREDIENTS

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5 tablespoons unsalted butter, divided

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1 sweet onion, thinly sliced

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3 garlic cloves, minced

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1 tablespoon grainy mustard

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2 cups half-and-half

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2 pounds potatoes, peeled and thinly sliced

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Salt and freshly ground black pepper

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1/2 teaspoon freshly grated nutmeg

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3/4 cup grated Gruyère cheese

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